Are you sure it truly was required? I, too, have the triple-play. I received emails and even a snail mail letter alerting me that my modem was old and not delivering the speed that I am paying for, and saying that I needed to upgrade. I went into my local "Xfinity store" and asked if they had a newer non-wifi model that I could update to; they did not.I have the Comcast triple-play package (TV/phone/internet), which limits my choices of modems to the Arris TG1682G. It was a "required upgrade" from my old modem.
So I have ignored it, and yet my service has kept on working flawlessly. After I have sufficient time to set up and test my Ooma service, I will put it into service, powered by the standalone modem that I also ordered.